Railway Derailment Containment Arms and Pocket Mechanism
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Solution Overview
Problem
Railway vehicle derailments due to wheel and bearing failures are a significant issue, causing damage to trains and surrounding areas, and existing solutions do not effectively prevent total derailment or manage the consequences of such events.
Innovation Solution
A derailment containment system with laterally spaced, free-ended arms on each side frame that create a pocket to receive a derailed rail, preventing further derailment and including a detection mechanism to alert of potential derailments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional wheel flanges are used to engage rails, then lateral displacement is inhibited during normal operation, but total derailment occurs when wheel or bearing failure happens
Solution Approach 1:
The patent applies preliminary action by pre-positioning the derailment containment apparatus with arms in a ready state above the rails. When derailment occurs, these pre-positioned arms immediately engage the derailed rail, preventing total derailment before the vehicle can completely leave the tracks. The detection mechanism also operates preliminarily to alert operators before catastrophic failure occurs.
Solution Approach 2:
The derailment containment apparatus acts as an intermediary between the derailed wheel assembly and the rail. The arms of the apparatus engage the derailed rail, serving as a mediating structure that prevents direct contact between the derailed vehicle and the ground, thereby containing the derailment and preventing complete departure from the tracks.
2Ease of manufacture
If narrow railbed configuration is used for cost and drainage purposes, then construction cost is reduced, but risk of vehicle overturning increases during derailment
Solution Approach 1:
The containment apparatus is pre-positioned on the narrow railbed structure, ready to engage derailed rails. This preliminary positioning allows the system to function effectively within the constrained space of narrow railbeds, preventing vehicle overturning despite the limited lateral space available for derailment containment.
3Device complexity
If no derailment detection mechanism is installed, then system complexity is reduced, but timely intervention during derailment is delayed
Solution Approach 1:
The detection mechanism provides feedback about the operational status of wheels and rails to the control system. When abnormal conditions are detected, the system generates alerts that enable timely intervention. This feedback loop allows operators to respond to potential derailments before they become catastrophic, reducing loss of time despite the added complexity of the detection system.
Data Source
AI summary
A system for containing derailment of a railway vehicle from rails over which the railway vehicle moves. The derailment system includes a derailment apparatus provided on each side frame of the railway vehicle. In one instance, each derailment apparatus has inner and outer laterally spaced and free ended depending arms disposed above a head section of the rails as long as the railway vehicle wheels ride on the rails. In the event either wheel becomes derailed, one the rails is received and accommodated within a pocket defined by the respective derailment apparatus. When a derailment occurs, the depending arms of the derailment apparatus extend below and to opposed sides of the head section of a rail received and accommodated in the pocket of the respective derailment apparatus whereby inhibiting total derailment of the railway vehicle from the rails over which the railway vehicle is traveling.